Dual-Output Power-Supply
Controller for Notebook Computers
MAX786
________________________________________________Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. +5V OUTPUT
CURRENT, 200kHz
100
VIN = 6V
VIN = 30V
EFFICIENCY (%)
VIN = 15V
100
EFFICIENCY vs. +5V OUTPUT
CURRENT, 300kHz
100
EFFICIENCY vs. +3.3V OUTPUT
CURRENT, 200kHz
VIN = 15V
90
VIN = 6V
EFFICIENCY (%)
VIN = 15V
80
VIN = 30V
70
+3.3V OFF
60
90
VIN = 6V
80
VIN = 30V
90
EFFICIENCY (%)
80
70
SYNC = 0V, +3.3V OFF
60
70
60
SYNC = 0V, +5V ON
50
1m
10m
100m
1
+5V OUTPUT CURRENT (A)
10
50
1m
10m
100m
1
+5V OUTPUT CURRENT (A)
10
50
1m
10m
100m
1
10
+3.3V OUTPUT CURRENT (A)
EFFICIENCY vs. +3.3V OUTPUT
CURRENT, 300kHz
100
QUIESCENT SUPPLY CURRENT (mA)
VIN = 15V
90
EFFICIENCY (%)
VIN = 6V
80
70
+5V ON
60
VIN = 30V
19
QUIESCENT SUPPLY CURRENT vs.
SUPPLY VOLTAGE
2.5
STANDBY SUPPLY CURRENT (mA)
STANDBY SUPPLY CURRENT vs.
SUPPLY VOLTAGE
18
ON3 = ON5 = HIGH
2
2.0
1.5
ON3 = ON5 = 0V
1.0
1
0.5
50
1m
10m
100m
1
10
+3.3V OUTPUT CURRENT (A)
0
0
6
12
18
24
30
SUPPLY VOLTAGE (V)
0
0
6
12
18
SUPPLY VOLTAGE (V)
24
30
SHUTDOWN SUPPLY CURRENT vs.
SUPPLY VOLTAGE
500
MINIMUM VIN TO VOUT DIFFERENTIAL (V)
SHUTDOWN SUPPLY CURRENT (µA)
1.0
MINIMUM VIN TO VOUT DIFFERENTIAL
vs. +5V OUTPUT CURRENT
1000
SWITCHING FREQUENCY (kHz)
SWITCHING FREQUENCY vs.
LOAD CURRENT
SYNC = REF (300kHz)
ON3 = ON5 = 5V
100
+5V, V
IN
= 7.5V
400
0.8
300kHz
300
SHDN = 0V
200
0.6
10
+5V, V
IN
= 30V
0.4
200kHz
+5V OUTPUT
STILL REGULATING
1
+3.3V, V
IN
= 7.5V
100
0.2
0
0
6
12
18
24
SUPPLY VOLTAGE (V)
30
0
1m
10m
100m
1
10
+5V OUTPUT CURRENT (A)
0.1
100µ
1m
10m
100m
1
LOAD CURRENT (A)
4
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
